Ideal Logic + are doing a 7 year warranty, so I’d be looking at them.
We fit them a lot, really simple inside, unlike the WB which seem to make things as complicated as possible.
As an example, I did a WB combi this week, it came fitted with a 3 core cable which was fine, but, they need 4 core to use an external thermostat. So the original cable is junked – they arent thought out too well, and do not meet the expectations that ther premium price demands.
Vaillant are no better than other makes, we used to fit them, and their other Brand, Glowworm, regularly (some models are virtually the same inside, and across the range they use the same internal components, but you pay more for the Vaillant).
We stopped fitting them as their Tech support was useless, and they supplied a ‘not fit for purpose’ wiring centre, which always failed in the guarantee period, costing us a lot of time, and irate customers with no heating.